I have a 2010 Impala LT that's throwing codes P0442 & P0455, both EVAP codes. The gas cap just got replaced, put in a new Canister Purge Solenoid, have a Canister VENT Solenoid on the way to try and fix these codes... newest issues that's risen (about 2 weeks after the EVAP Codes have come up) is surging.... I'll be doing 40-50MPH and cruising steadily, when I'll feel the car surge, and I'll glance down and the tach goes up 200-500RPM, it only lasts a second and then go back to normal. When driving up a small incline doing, say 30MPH, it feels like it's stuttering up the hill, it'll jerk forward then drive nice, jerk jerk jerk, and then nice again.

Would this be indicative of a clogged fuel filter? Where is that thing located on my vehicle? Hard to replace?

It wouldn't hurt to check your fuel pressure. I don't know the spec, but at autozone we rent fuel pressure testers. At our store, if you do it in the parking lot, we don't ask you to put down the deposit, but it is a 150 dollar deposit if you want to take it home to do the tests, but the ampunt is fully refundable. In the manual that comes with the tester, it lists the acceptable fuel pressure spec.

I see you received some great feedback from the forum members, and I'd be happy to investigate further if you'd like. Would you consider taking your Impala to a dealership for service? Please don't hesitate to send me a direct message anytime with the last eight of your VIN and I can look into it for you.

No. I have yet to find a dealership that is easy to work with and reasonable pricewise compared to a non-dealership garage. I had a thermostat replace by a dealer under the powertrain warranty, and ever since then it's been making a "swishing" sound when I start it up... dealership wants $$ to investigate that sound, something I don't have money for.

About 3 weeks ago I started getting Emissions codes. I've been slow to gather money to replace some of the sensors, and now this bucking/surging issue has arisen. I'm beginning to dislike GM.

Mike

Quote:

Originally Posted by ChevroletCustomerService

Hi Mike,

I see you received some great feedback from the forum members, and I'd be happy to investigate further if you'd like. Would you consider taking your Impala to a dealership for service? Please don't hesitate to send me a direct message anytime with the last eight of your VIN and I can look into it for you.

I can appreciate that, Mike, and thank you for clarifying. I'm very sorry that you've been experiencing this, and I hope this community is able to provide Do-It-Yourself help for you if you prefer that approach. We recommend visiting a dealership for an initial diagnosis and documentation before I can step in to follow-up with the dealership and work towards a resolution.

I'm also saddened to hear about your previous dealer experience; if you'd ever like me to find alternative dealers in your area, just let me know!

Right ^^. I don't remember the explanation, but I was convinced it was not to our detriment.....wish I could remember the rationale behind it.

The purpose, which makes sense when you think about it, is to keep any sediment etc. from entering the fuel pump in the first place. Many are using paper type filters which do a better job of filtering out small particles, instead of the nylon screens that electric fuel pumps used for years. Of course the downside is that when the filter does fail you have to replace the pump and all. Fortunately, GM fuel pumps don't seem like they fail as often as they did around the mid-late 90s.

The purpose, which makes sense when you think about it, is to keep any sediment etc. from entering the fuel pump in the first place. Many are using paper type filters which do a better job of filtering out small particles, instead of the nylon screens that electric fuel pumps used for years. Of course the downside is that when the filter does fail you have to replace the pump and all. Fortunately, GM fuel pumps don't seem like they fail as often as they did around the mid-late 90s.

This may seem OCD & I have never done it but...

A mechanic friend of mine uses those lil nylon socks they have at shoe stores (for trying on shoes)
On the end of the filler hose when he puts gas in his car. Says he never needs to change fuel filters 'cause of this. I dunno?
He's animate about it...

Seems like a lot of trouble and potentially getting gas smell on your hands for the price of a fuel filter (sounds like his car still has changable filters if he is doing this, partly to avoid changing fuel filters).